Process of improving the grade of calcium cyanamid.



G. EL COX,

PROCESS GF iMFROJBbG THE GRADE 0F CALCIUM CYANANHD.

Paeted Au. 1

2 FILED DEC. 3` ISYI?.

APFUCAUQI @woe/vibo@ C020, @y

vamid; and I do proving the v erase. razr rrr Fidi@ @EGBGB E. COX, 0F NIAGARA FALLS, NEW YORK, ASSGNOR T0 AMERICAN' YORK, N. Y., A. CRPORATION 0F MMNE.

COMPNY, 0F NEW PROCESS 0F IMPROVING THE G ,275,535, Specification of eravamo BABE 0F CALCIUM CYANAVIIE Letters Patent Patented Aug. i3, 19185.

plantation ined neeember s, 1917. sei-iai no. :mama

To all 'whom t may concern.'

e it knoWn-that I, GEORGE E. Cox, a citizen of the United States, residing at iagara Falls, in the county of Niagara and ate of N evv York, have invented certain -neW and useful Improvements in Processes of Improving the Grade of Calcium Cyanhereby declare the fol oW- mg to be a full, clear, and exact description of the invention, such as will enable otl'iers skilled in the art to which it appertains izo make and use the same.

his invention relates to a process of im* gra-de and reducing the consumption of raw materials in the manufacture of commercial calcium cyanamid and has for its object to ,accomplish these rcsults in a. simple and effective manner.

' To these ends thel invention consists in the novel steps and combinations of steps -constituting the process, allI as will be more fully hereinafter disclosed and particularly pointed out in the claims.

eferring to the accompanying drawings forming a part of this specification, the igl'ure is a diagrammatic illustration of one 'form of construction, suitable for carrying out the invention. I

In order that the precise process and apparatus may be the more clearly understood it is said I am familiar with the p rocess of and granted to Washburn, With the disclosure of U. S. #1,103,060, method and mea-ns4 for nitrogen, granted to W. S Landis. `In the iirst mentioned pat-onta foraminous vessel is provided for holding the carbid which vessel is perforated, and to prevent the finely ground carbid from passing through the partei-ations, the said vessel is lined with a combustible material., or in conjunction with the orinninous vessel a suitable screen of Wire cloth is used to prevent the sifting of the carbid. yTh is said process alsoprovides for using a ioraminous vessel made wholly` of wire screen cloth which may be used in conjunction with a combustible material.,

rially lower cost.

But a disadvantage .of'this' said process lies in the fact that the foraminous vessel being used to handle or transport its load of carbid, before nitrilication, as Well as the linished lime nitrogen, afterthe reaction is completed, it must material weight and' strength and there- Afore, it is more or less costlyfto construct,

Well as to handle. Further, itis subjected to a highy temperature for a .long period of time, and itsdeteriorationis, therefore, quite costly. ,lt is largely to avoid this deterioration and its consequent high cost of replacement that I have developed the process to be descrrbed below. A

In the second process referred to above, a. similar metal perforated vessel, lined with a porous or textile fabric, is used for containing i'he carbid. objections as those above stated,l in that a vessel of considerable weightand strength must be provided for transporting the carbid andthe deterioration of this vessel is quite considerable.

YV'Vitli 'this purpose of entirelyeliminating in connection with the process disclosed in my copending application No. 205216 filed Dec. 3, and entitled Method of makingv calcium cyanamid, a means wherelfiy l can eliminate in this application the use of the expensive metal containing vessel and at the same time obtain a better utilization of the raw materials as Well 'as ahigher grade That is to say, said Acopending application provides for charging thc carbid directly vinto its empty container while in place inside the nitrogen fixation oven. ln that processl l am therefore enabled to dispense with thc transport ol the finely ground car bid in the ,sa-mc container that holds it in the furnace, and can thereby eliminate the requirement ot the heretofore necessary 1nechanical strength in said coiltaincr.

ln the process ol this application, I use the regular forni oi: common in the industry. into thisoven, .l place a suitable collapsible metallic form or be .made ol metal of cyanannd oven A suitable removable form; inserting in said In testimonywhereof I ax my signature orm a sleeve of perforated paper; charging 1n presence of two witnesses.

ely ound carbid into said sleeve' covl ering gire mass of carbid with a heatinsu- GEORGE E' COX' 5 lating cover; removing said form; and pro- Witnesses: Y

ceeding with thenitrifieation of said carbid, WALTER S. LANms,

substantially as described. A. ANDERSON. 

